Method and apparatus for transmitting/receiving data in a relay communication system

1. A method for transmitting data by a base station in a wireless system, the method comprising: transmitting a downlink signal to a relay node or a terminal by using a special subframe, wherein the special subframe includes a first transmission period and a second transmission period, wherein the first transmission period is set to transmit the downlink signal to the relay node or the terminal, wherein the second transmission period is set to transmit the downlink signal to the relay node and is set to not decode a reference signal by the terminal, wherein special subframe configurations for a transmitting end and a receiving end are different from each other, and wherein the transmitting end and the receiving end are determined based on the number of downlink subframes and uplink subframes, and the base station is set to the transmitting end when the number of uplink subframes is larger than the number of downlink subframes, and the base station is set to the receiving end when the number of downlink subframes is larger than the number of uplink subframes.

2. The method of claim 1 , wherein the special subframe further includes a guard period between the first transmission period and the second transmission period, and a garbage signal is transmitted to the relay node or the terminal during the guard period.

3. The method of claim 1 , further comprising: entering an uplink signal reception mode to receive an uplink signal from the relay node or the terminal, after transmitting the downlink signal to the relay node via the second transmission period.

4. A method for transceiving data by a relay node in a wireless system, the method comprising: transceiving a downlink signal to a base station or a terminal by using a special subframe, wherein the special subframe includes a first transmission period and a second transmission period, wherein the first transmission period is set to transmit the downlink signal to the terminal, wherein the second transmission period is set to receive the downlink signal from the base station and is set to not decode a reference signal by the terminal, wherein special subframe configurations for a transmitting end and a receiving end are different from each other, and wherein the transmitting end and the receiving end are determined based on the number of downlink subframes and uplink subframes, and the relay node is set to the receiving end when the number of uplink subframes is larger than the number of downlink subframes, and the relay node is set to the transmitting end when the number of downlink subframes is larger than the number of uplink subframes.

5. The method of claim 4 , wherein the special subframe further includes a guard period between the first transmission period and the second transmission period, and a mode conversion from a transmission mode to a reception mode is executed during the guard period.

6. The method of claim 4 , further comprising: entering an uplink signal reception mode to receive an uplink signal from the terminal, after receiving the downlink signal from the base station via the second transmission period.

7. A method for transmitting data by a base station in a wireless system, the method comprising: transmitting a downlink signal to a relay node or a terminal by using a special subframe, wherein at least one transmission period of the special subframe is set to transmit the downlink signal, through multiplexing, to the relay node and the terminal, and wherein the at least one transmission period is set to not decode a reference signal by the terminal, wherein special subframe configurations for a transmitting end and a receiving end are different from each other, and wherein the transmitting end and the receiving end are determined based on the number of downlink subframes and uplink subframes, and the base station is set to the transmitting end when the number of uplink subframes is larger than the number of downlink subframes, and the base station is set to the receiving end when the number of downlink subframes is larger than the number of uplink subframes.

8. The method of claim 7 , further comprising: entering an uplink signal reception mode to receive an uplink signal from the relay node or the terminal, after transmitting the downlink signal, through multiplexing, to the relay node and the terminal.

9. A method for transceiving data by a relay node in a wireless system, the method comprising: transceiving a downlink signal to a base station or a first terminal by using a special subframe, wherein the special subframe includes a first transmission period and a second transmission period, wherein the first transmission period is set to transmit the downlink signal to the first terminal, wherein the second transmission period is set to receive the downlink signal by the first terminal from the base station and is set to receive the downlink signal multiplexed by a second terminal from the base station, wherein at least one transmission period of the special subframe is set to not decode a reference signal by the first and second terminals, wherein special subframe configurations for a transmitting end and a receiving end are different from each other, and wherein the transmitting end and the receiving end are determined based on the number of downlink subframes and uplink subframes, and the base station is set to the transmitting end when the number of uplink subframes is larger than the number of downlink subframes, and the base station is set to the receiving end when the number of downlink subframes is larger than the number of uplink subframes.

10. The method of claim 9 , further comprising: entering an uplink signal reception mode to receive an uplink signal from the first terminal, after the downlink signal is transmitted to the first terminal from the base station and after the downlink signal is transmitted to the second terminal from the base station through multiplexing.

11. A method for transmitting data in a wireless system, the method comprising: transmitting a downlink signal, by a base station, to a relay node by using a special subframe; and transmitting the downlink signal, by the relay node, to the base station or a second terminal by using the special subframe, wherein the special subframe includes a first transmission period and a second transmission period, wherein the first transmission period is set to transmit the downlink signal from the base station to the relay node or a first terminal or the second terminal, wherein the second transmission period is set to transmit the downlink signal from the base station to the relay node, wherein the second transmission period is set to not decode a reference signal by the first and second terminals, wherein special subframe configurations for a transmitting end and a receiving end are different from each other, and wherein the transmitting end and the receiving end are determined based on the number of downlink subframes and uplink subframes, and the base station is set to the transmitting end when the number of uplink subframes is larger than the number of downlink subframes, and the base station is set to the receiving end when the number of downlink subframes is larger than the number of uplink subframes.

12. The method of claim 11 , wherein the first transmission and the second transmission period from a perspective of the base station do not match the first transmission and the second transmission period from a perspective of the relay node.

13. The method of claim 11 , wherein the first transmission period corresponds to a Downlink Pilot Time Slot from a perspective of the first and second terminals, and the second transmission period corresponds to at least part of a guard period from a perspective of the first and second terminals.

14. An apparatus for transmitting/receiving data, the apparatus comprising: a radio frequency unit (RF unit); and a processor, wherein the processor is configured to transmit a downlink signal to a relay node or a terminal by using a special subframe, wherein the special subframe includes a first and a second transmission periods, wherein the first transmission period is set to transmit the downlink signal to the relay node or the terminal, and wherein the second transmission period is set to transmit the downlink signal to the relay node and is set to not decode a reference signal by the terminal, wherein special subframe configurations for a transmitting end and a receiving end are different from each other, and wherein the transmitting end and the receiving end are determined based on the number of downlink subframes and uplink subframes, and the relay node is set to the receiving end when the number of uplink subframes is larger than the number of downlink subframes, and the relay node is set to the transmitting end when the number of downlink subframes is larger than the number of uplink subframes.

15. An apparatus for transmitting/receiving data, the apparatus comprising: a radio frequency unit (RF unit); and a processor, wherein the processor is configured to transceive a downlink signal to a base station or a terminal by using a special subframe, wherein the special subframe includes a first transmission period and a second transmission period, wherein the first transmission period is set to transmit the downlink signal to the terminal, and wherein the second transmission period is set to receive the downlink signal from the base station and is set to not decode a reference signal by the terminal, wherein special subframe configurations for a transmitting end and a receiving end are different from each other, and wherein the transmitting end and the receiving end are determined based on the number of downlink subframes and uplink subframes, and the base station is set to the transmitting end when the number of uplink subframes is larger than the number of downlink subframes, and the base station is set to the receiving end when the number of downlink subframes is larger than the number of uplink subframes.